This problem introduces repeated doubling in the context of a plant with branches that split into 2 more branches every week. The problem lays the foundation for understanding exponential growth and lends itself to a variety of representations. The Teachers' Notes page offers rationale, suggestions for implementation, discussion questions, and ideas for extension and support.

A black hole is created when an extremely large star has a supernova explosion and the remaining core is swallowed by its own gravity. The gravitational forces within a black hole are so strong light is not able to escape.

Temperatures can reach 15 million degrees Celsius at the center of the sun.

As a comet orbits the sun, solar wind pushes the gases outward in a trailing tail.

Giant stars have a diameter of 10 to 100 times the size of the sun. White dwarfs are smaller stars that can be smaller than Earth.

The sun is the center of the solar system around which Earth and the other planets orbit. The planets travel in an ellipse around the sun.

The sun is the center of the solar system around which Earth, the other plants, and their moons revolve. Inertia causes planets to remain in motion. The pull of gravity between the sun and planets keeps the planets from flying off into space.

A supernova is a huge explosion that results when a massive star has burned up most of its fuel and breaks apart. The resulting core can form a smaller, dense star called a neutron star.

UEN Homeroom wants to help you get burned in with education. This week we welcome Amber Harper, the Burned In Teacher, to talk about teacher burnout and how to re-energize educators. Our topics include: the reasons that teachers suffer from burnout, the three types of burnout and their characteristics, how to overcome anxiety and frustration as a teacher and more.

This book explores how to support student sensemaking of science concepts. It includes specific vignettes, examples, and practical suggestions for implementing in the classroom.

Through a close reading of "Amelia Bedelia", students reread the material to discuss text-dependent questions, promoting deep thinking about the text and its characters.

This webpage includes information about the amendments to the U.S. Constitution and their role in the history of the United States of America.

Educators can use America From Scratch (and its discussion guides) to engage the most important issues of the day, and to encourage critical thinking and promote civic engagement with their students.

This course focuses on the Great Depression and World War II and how they led to a major reordering of American politics and society. We will examine how ordinary people experienced these crises and how those experiences changed their outlook on politics and the world around them.

This primary source set includes documents and images from the lives of American authors in the 19th century. A teacher guide is included to assist educators in utilizing the primary sources in their instruction.

An article based on data and evidence that includes charts and information that can be analyzed statistically by students.

This annotated slideshow adapted from KET's Electronic Field Trip to the Forest illustrates how blight decimated the American chestnut tree and the methods scientists use to identify and pollinate the remaining trees to create blight-resistant trees.